nsc_list.c revision fcf3ce441efd61da9bb2884968af01cb7c1452cc
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Generic lists
* Lists are circular, doubly-linked, with headers.
* When a list is empty, both pointers in the header
* point to the header itself.
*/
#include "nsc_list.h"
/*
* void
* ls_remove(ls_elt_t *)
* Unlink donated element for list.
*
* Calling/Exit State:
* Resets elements pointers to empty list state.
*/
void
ls_remove(ls_elt_t *p)
{
p->ls_prev->ls_next = p->ls_next;
p->ls_next->ls_prev = p->ls_prev;
LS_INIT(p);
}
/*
* void
* ls_ins_after(ls_elt_t *, ls_elt_t *)
*
* Link new into list after old.
*
* Calling/Exit State:
*
* None.
*/
void
ls_ins_after(ls_elt_t *old, ls_elt_t *new)
{
new->ls_next = old->ls_next;
new->ls_prev = old;
new->ls_next->ls_prev = new;
new->ls_prev->ls_next = new;
}
/*
* void
* ls_ins_before(ls_elt_t *, ls_elt_t *)
* Link new into list after old.
*
* Calling/Exit State:
*
* None.
*/
void
ls_ins_before(ls_elt_t *old, ls_elt_t *new)
{
new->ls_prev = old->ls_prev;
new->ls_next = old;
new->ls_prev->ls_next = new;
new->ls_next->ls_prev = new;
}